@inbook{47621, author = {{Althoff, Sebastian}}, booktitle = {{Mimesis Expanded: Die Ausweitung der mimetischen Zone}}, editor = {{Balke, Friedrich and Linseisen, Elisa}}, pages = {{343–362}}, publisher = {{Wilhelm Fink}}, title = {{{Zweierlei Homophilie: Wendy Hui Kyong Chun und Leo Bersani}}}, doi = {{10.30965/9783846764947_016}}, year = {{2022}}, } @misc{47666, author = {{Miggelbrink, Monique}}, booktitle = {{Cargo H. 56}}, pages = {{72--74}}, title = {{{Musterbildungen. Ein alternativer Zugang zur Fernsehgeschichte: Über Lynn Spigels TV Snapshots – An Archive of Everyday Life}}}, year = {{2022}}, } @article{47670, abstract = {{PurposeThe purpose of this paper is to revisit the disastrous DaimlerChrysler AG takeover episode from 1998 to 2007 in order to arrive at a more comprehensive explanation of this and other merger and takeover failures based on institutional theory.Design/methodology/approachThe case study is based on various secondary sources of information and on the insights that one of the authors gained from working for 14 years in various positions for Daimler-Benz and DaimlerChrysler.FindingsDaimlerChrysler failed because top management made mistakes in trying to globalize the company. They were unable to realize possible synergies between the two companies, which brought complementary resources into the merger. Furthermore, they did not account for the institutional embeddedness of strategies when they adopted lean production globally, diffused the production system developed in Germany to other parts of the world and tried to implement a global stock enlisted in New York and Frankfurt. The underlying theoretical framework is relevant for other merger and acquisition cases. It features institutional embeddedness, path dependency and institutional arbitrage.Originality/valueThe paper develops an institutional perspective on DaimlerChrysler and on cross-border merger and acquisition failure more generally. The perspective is organized around the varieties-of-capitalism approach. This contribution is important because there is increasing dissatisfaction with the dominant explanation of cross-border merger and acquisition failure, which is based on the allegedly failed management of culture “clashes.”}}, author = {{Riach, John Rankin Wood and Schneider, Martin}}, issn = {{2059-5794}}, journal = {{Cross Cultural and Strategic Management}}, keywords = {{Organizational Behavior and Human Resource Management, Strategy and Management, Sociology and Political Science, Cultural Studies, Business and International Management}}, number = {{3}}, pages = {{552--568}}, publisher = {{Emerald}}, title = {{{The DaimlerChrysler takeover failure revisited from a varieties-of-capitalism perspective}}}, doi = {{10.1108/ccsm-12-2020-0250}}, volume = {{29}}, year = {{2022}}, } @inproceedings{27531, abstract = {{The Quantum Singular Value Transformation (QSVT) is a recent technique that gives a unified framework to describe most quantum algorithms discovered so far, and may lead to the development of novel quantum algorithms. In this paper we investigate the hardness of classically simulating the QSVT. A recent result by Chia, Gily\'en, Li, Lin, Tang and Wang (STOC 2020) showed that the QSVT can be efficiently "dequantized" for low-rank matrices, and discussed its implication to quantum machine learning. In this work, motivated by establishing the superiority of quantum algorithms for quantum chemistry and making progress on the quantum PCP conjecture, we focus on the other main class of matrices considered in applications of the QSVT, sparse matrices. We first show how to efficiently "dequantize", with arbitrarily small constant precision, the QSVT associated with a low-degree polynomial. We apply this technique to design classical algorithms that estimate, with constant precision, the singular values of a sparse matrix. We show in particular that a central computational problem considered by quantum algorithms for quantum chemistry (estimating the ground state energy of a local Hamiltonian when given, as an additional input, a state sufficiently close to the ground state) can be solved efficiently with constant precision on a classical computer. As a complementary result, we prove that with inverse-polynomial precision, the same problem becomes BQP-complete. This gives theoretical evidence for the superiority of quantum algorithms for chemistry, and strongly suggests that said superiority stems from the improved precision achievable in the quantum setting. We also discuss how this dequantization technique may help make progress on the central quantum PCP conjecture.}}, author = {{Gharibian, Sevag and Gall, François Le}}, booktitle = {{Proceedings of the 54th ACM Symposium on Theory of Computing (STOC)}}, pages = {{19--32}}, title = {{{Dequantizing the Quantum Singular Value Transformation: Hardness and Applications to Quantum Chemistry and the Quantum PCP Conjecture}}}, year = {{2022}}, } @book{47869, author = {{Tenberge, Claudia and von Braunmühl, Susanne }}, publisher = {{Friedrich Verlag}}, title = {{{Ich. Das bin ich! Zugehörigkeit, Freundschaft und Familie. Zyklus 2}}}, year = {{2022}}, } @book{47872, author = {{Tenberge, Claudia and von Braunmühl, Susanne}}, publisher = {{Friedrich Verlag}}, title = {{{Lebensformen, Welt, Gesellschaft. Alltagsleben, Gemeinschaft und Feste. Zyklus 2. }}}, year = {{2022}}, } @book{47871, author = {{Tenberge, Claudia and von Braunmühl, Susanne}}, title = {{{Ich und die anderen. Zugehörigkeit, Freundschaft und Familie. Zyklus 2.}}}, year = {{2022}}, } @book{47883, author = {{Tenberge, Claudia and von Braunmühl, Susanne}}, publisher = {{Friedrich Verlag}}, title = {{{Kultur und Kommunikation. Religion, Sprache und Verständigung. Zyklus 3. }}}, year = {{2022}}, } @book{47884, author = {{Tenberge, Claudia and von Braunmühl, Susanne}}, publisher = {{Friedrich Verlag}}, title = {{{Große Fragen. Welt und Wahrheit. Leben und Tod. Zyklus 3.}}}, year = {{2022}}, } @book{47881, author = {{Tenberge, Claudia and von Braunmühl, Susanne}}, title = {{{Lebensformen, Welt, Gesellschaft. Normen und Werte - Religionen und Kulturen. Zyklus 3.}}}, year = {{2022}}, } @book{47882, author = {{Tenberge, Claudia and von Braunmühl, Susanne}}, title = {{{Mensch, Natur, Technik. Lebenswelt, Information und Sprache. Zyklus 3. }}}, year = {{2022}}, } @article{47984, abstract = {{Recent analyses by polarization resolved second-harmonic (SH) microscopy have demonstrated that ferroelectric (FE) domain walls (DWs) can possess non-Ising wall characteristics and topological nature. These analyses rely on locally analyzing the properties, directionality, and magnitude of the second-order nonlinear tensor. However, when inspecting FE DWs with SH microscopy, a manifold of different effects may contribute to the observed signal difference between domains and DWs, i.e., far-field interference, Čerenkov-type phase-matching (CSHG), and changes in the aforementioned local nonlinear optical properties. They all might be present at the same time and, therefore, require careful interpretation and separation. In this work, we demonstrate how the particularly strong Čerenkov-type contrast can selectively be blocked using dark- and bright-field SH microscopy. Based on this approach, we show that other contrast mechanisms emerge that were previously overlayed by CSHG but can now be readily selected through the appropriate experimental geometry. Using the methods presented, we show that the strength of the CSHG contrast compared to the other mechanisms is approximately 22 times higher. This work lays the foundation for the in-depth analysis of FE DW topologies by SH microscopy.}}, author = {{Hegarty, Peter A. and Beccard, Henrik and Eng, Lukas M. and Rüsing, Michael}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{24}}, publisher = {{AIP Publishing}}, title = {{{Turn all the lights off: Bright- and dark-field second-harmonic microscopy to select contrast mechanisms for ferroelectric domain walls}}}, doi = {{10.1063/5.0094988}}, volume = {{131}}, year = {{2022}}, } @article{47982, abstract = {{Spontaneous Raman spectroscopy (SR) is a versatile method for analysis and visualization of ferroelectric crystal structures, including domain walls. Nevertheless, the necessary acquisition time makes SR impractical for in situ analysis and large scale imaging. In this work, we introduce broadband coherent anti-Stokes Raman spectroscopy (B-CARS) as a high-speed alternative to conventional Raman techniques and demonstrate its benefits for ferroelectric domain wall analysis. Using the example of poled lithium niobate, we compare the spectral output of both techniques in terms of domain wall signatures and imaging capabilities. We extract the Raman-like resonant part of the coherent anti-Stokes signal via a Kramers–Kronig-based phase retrieval algorithm and compare the raw and phase-retrieved signals to SR characteristics. Finally, we propose a mechanism for the observed domain wall signal strength that resembles a Čerenkov-like behavior, in close analogy to domain wall signatures obtained by second-harmonic generation imaging. We, thus, lay here the foundations for future investigations on other poled ferroelectric crystals using B-CARS.}}, author = {{Reitzig, Sven and Hempel, Franz and Ratzenberger, Julius and Hegarty, Peter A. and Amber, Zeeshan H. and Buschbeck, Robin and Rüsing, Michael and Eng, Lukas M.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, keywords = {{Physics and Astronomy (miscellaneous)}}, number = {{16}}, publisher = {{AIP Publishing}}, title = {{{High-speed hyperspectral imaging of ferroelectric domain walls using broadband coherent anti-Stokes Raman scattering}}}, doi = {{10.1063/5.0086029}}, volume = {{120}}, year = {{2022}}, } @article{47986, abstract = {{Conductive domain walls (DWs) in insulating ferroelectrics have recently attracted considerable attention due to their unique topological, optical, and electronic properties, and offer potential applications such as in memory devices or rewritable circuitry. The electronic properties of DWs can be tuned by the application of strain, hence controlling the charge carrier density at DWs. In this paper, we study the influence of uniaxial stress on the conductivity of DWs in the bulk single crystal lithium niobate (LiNbO3). Using conductive atomic force microscopy, we observe a large asymmetry in the conductivity of DWs, where only negatively screened walls, so called head-to-head DWs, are becoming increasingly conductive, while positively screened, tail-to-tails DWs, show a decrease in conductivity. This asymmetry of DW conductivity agrees with our theoretical model based on the piezoelectric effect. In addition, we observed that the current in the DW increases up to an order of magnitude for smaller compressive stresses of 100 MPa. This response of DWs remained intact for multiple stress cycles over two months, opening a path for future applications.}}, author = {{Singh, Ekta and Beccard, Henrik and Amber, Zeeshan H. and Ratzenberger, Julius and Hicks, Clifford W. and Rüsing, Michael and Eng, Lukas M.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{14}}, publisher = {{American Physical Society (APS)}}, title = {{{Tuning domain wall conductivity in bulk lithium niobate by uniaxial stress}}}, doi = {{10.1103/physrevb.106.144103}}, volume = {{106}}, year = {{2022}}, } @article{47985, abstract = {{Strongly charged head-to-head domain walls that are purposely engineered along the [110] crystallographic orientation into ferroelectric BaTiO3 single crystals have been proposed as intrinsically nanoscaled two-dimensional electron gases (2DEGs) because of their significant conductivity. Here, we quantify these 2DEG properties through dedicated Hall transport measurements in van der Pauw 4-point geometry, finding the electron mobility to reach around 400 cm2 (V s)^{−1}, while the two-dimensional charge density amounts to 7 × 103 cm^{–2}. We underline the necessity to take into account the thermal and geometrical misalignment offset voltages by evaluating the Hall resistance under magnetic field sweeps; otherwise, errors of several hundred percent in the derived transport parameters can occur.}}, author = {{Beccard, Henrik and Kirbus, Benjamin and Beyreuther, Elke and Rüsing, Michael and Bednyakov, Petr and Hlinka, Jiří and Eng, Lukas M.}}, issn = {{2574-0970}}, journal = {{ACS Applied Nano Materials}}, keywords = {{General Materials Science}}, number = {{7}}, pages = {{8717--8722}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Nanoscale Conductive Sheets in Ferroelectric BaTiO3: Large Hall Electron Mobilities at Head-to-Head Domain Walls}}}, doi = {{10.1021/acsanm.2c01919}}, volume = {{5}}, year = {{2022}}, } @inproceedings{47981, author = {{Golde, Jonas and Rüsing, Michael and Kindler, Richard and Steuer, Svea and Rix, Jan and Eng, Lukas M. and Koch, Edmund}}, booktitle = {{Optical Components and Materials XIX}}, editor = {{Digonnet, Michel J. and Jiang, Shibin}}, location = {{San Francisco, California, United States}}, publisher = {{SPIE}}, title = {{{Investigation of ferroelectric domain walls in periodically-poled LiNbO3 single crystals by polarization-sensitive optical coherence tomography}}}, doi = {{10.1117/12.2608470}}, year = {{2022}}, } @article{47989, abstract = {{Thin-film materials from μm thickness down to single-atomic-layered 2D materials play a central role in many novel electronic and optical applications. Coherent, nonlinear optical (NLO) μ-spectroscopy offers insight into the local thickness, stacking order, symmetry, or electronic and vibrational properties. Thin films and 2D materials are usually supported on multi-layered substrates leading to (multi-)reflections, interference, or phase jumps at interfaces during μ-spectroscopy, which all can make the interpretation of experiments particularly challenging. The disentanglement of the influence parameters can be achieved via rigorous theoretical analysis. In this work, we compare two self-developed modeling approaches, a semi-analytical and a fully vectorial model, to experiments carried out in thin-film geometry for two archetypal NLO processes, second-harmonic and third-harmonic generation. In particular, we demonstrate that thin-film interference and phase matching do heavily influence the signal strength. Furthermore, we work out key differences between three and four photon processes, such as the role of the Gouy-phase shift and the focal position. Last, we can show that a relatively simple semi-analytical model, despite its limitations, is able to accurately describe experiments at a significantly lower computational cost as compared to a full vectorial modeling. This study lays the groundwork for performing quantitative NLO μ-spectroscopy on thin films and 2D materials, as it identifies and quantifies the impact of the corresponding sample and setup parameters on the NLO signal, in order to distinguish them from genuine material properties.<}}, author = {{Amber, Zeeshan H. and Spychala, Kai J. and Eng, Lukas M. and Rüsing, Michael}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, keywords = {{General Physics and Astronomy}}, number = {{21}}, publisher = {{AIP Publishing}}, title = {{{Nonlinear optical interactions in focused beams and nanosized structures}}}, doi = {{10.1063/5.0125926}}, volume = {{132}}, year = {{2022}}, } @article{47987, abstract = {{AbstractPure samples of colorless, air‐stable Ba(BO2OH) crystals were obtained from Ba(NO3)2 and H3BO3 under the ultra‐alkaline conditions of a KOH hydroflux at about 250 °C. The product formation depends on the water‐base molar ratio and the molar ratio of the starting materials. B(OH)3 acts as a proton donor (Brønsted acid) rather than a hydroxide acceptor (Lewis acid). Ba(BO2OH) crystallizes in the non‐centrosymmetric orthorhombic space group P212121. Hydrogen bonds connect the almost planar (BO2OH)2− anions, which are isostructural to HCO3−, into a syndiotactic chain. IR and Raman spectroscopy confirm the presence of hydroxide groups, which are involved in weak hydrogen bonds. Upon heating in air to about 450 °C, Ba(BO2OH) dehydrates to Ba2B2O5. Moreover, the non‐centrosymmetric structure of Ba(BO2OH) crystals was verified with power‐dependent confocal Second Harmonic Generation (SHG) microscopy indicating large conversion efficiencies in ambient atmosphere.}}, author = {{Li, Yuxi and Hegarty, Peter A. and Rüsing, Michael and Eng, Lukas M. and Ruck, Michael}}, issn = {{0044-2313}}, journal = {{Zeitschrift für anorganische und allgemeine Chemie}}, keywords = {{Inorganic Chemistry}}, number = {{21}}, publisher = {{Wiley}}, title = {{{Ba(BO2OH) – A Monoprotonated Monoborate from Hydroflux Showing Intense Second Harmonic Generation}}}, doi = {{10.1002/zaac.202200193}}, volume = {{648}}, year = {{2022}}, } @article{47988, abstract = {{Second harmonic (SH) microscopy represents a powerful tool for the investigation of crystalline systems, such as ferroelectrics and their domain walls (DWs). Under the condition of normal dispersion, i.e., the refractive index at the SH wavelength is larger as compared to the refractive index at the fundamental wavelength, n(2ω)>n(ω), bulk crystals will generate no SH signal. Should the bulk, however, contain DWs, an appreciable SH signal will still be detectable at the location of DWs stemming from the Čerenkov mechanism. In this work, we demonstrate both how SH signals are generated in bulk media and how the Čerenkov mechanism can be inhibited by using anomalous dispersion, i.e., n(ω)